Perhaps you should try some spelling variations:
trinh hien » trinh thien, trinh dien, trinh bien
vien nhan » dien nhan, vien than, trien nhan
hien quy » thien quy, hieu quy, trien quy
quy tinh » quy trinh, quy dinh, quy tin
tinh cua » trinh cua, sinh cua, tinh chat
hoc vien » hoc hien, hoc viet, hoc tieng
viet va » viet van, viet ha, tiet va
va hoc » van hoc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: giao trinh hien quy tinh cua nguoi viet va hoc vien nhan~.
• Adding a wildcard symbol may retrieve word variants: giao trinh hien quy tinh cua nguoi viet va hoc vien nhan*.